rawtherapee: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/rawtherapee - from package: rawtherapee

You may install the required package with command apt-get install {package}

Error in other languages:
rawtherapee: bevel nie gevind nie
rawtherapee: comandă negăsită
rawtherapee: comando não encontrado
rawtherapee: commande introuvable
rawtherapee: command not found
rawtherapee: käsku ei ole
rawtherapee: không tìm thấy lệnh
rawtherapee: komanda nerasta
rawtherapee: Kommando nicht gefunden.
rawtherapee: kommandot finns inte
rawtherapee: komut yok
rawtherapee: nie znaleziono polecenia
rawtherapee: níor aimsíodh an t-ordú
rawtherapee: no se encontró la orden
rawtherapee: no s'ha trobat l'ordre
rawtherapee: opdracht niet gevonden
rawtherapee: parancs nem található
rawtherapee: perintah tidak ditemukan
rawtherapee: príkaz nenájdený
rawtherapee: příkaz nenalezen
rawtherapee: команда не найдена
rawtherapee: командата не е открита
rawtherapee: 命令找不到
rawtherapee: コマンドが見つかりません